/*
    This file is part of the ChipWhisperer Example Targets
    Copyright (C) 2016-2017 NewAE Technology Inc.

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "hal.h"
#include "simpleserial.h"
#include <string.h>
#include <stdint.h>
#include <stdlib.h>

#if (HAL_TYPE == HAL_xmega) || (HAL_TYPE == HAL_avr)

#include "bigint.h"
#include "rsa_basic.h"

#define BIGINT_CEIL(x) ((((x) + sizeof(bigint_word_t) - 1) / sizeof(bigint_word_t)) *  sizeof(bigint_word_t))
#define BIGINT_OFF(x) ((sizeof(bigint_word_t) - (x) % sizeof(bigint_word_t)) % sizeof(bigint_word_t))

/**********************************************************************************************
   RSA KEY #0
**********************************************************************************************/

/* Modulus: */
const uint8_t modulus[] PROGMEM = {
0xa8, 0xb3, 0xb2, 0x84, 0xaf, 0x8e, 0xb5, 0x0b, 0x38, 0x70, 0x34, 0xa8, 0x60, 0xf1, 0x46, 0xc4,
0x91, 0x9f, 0x31, 0x87, 0x63, 0xcd, 0x6c, 0x55, 0x98, 0xc8, 0xae, 0x48, 0x11, 0xa1, 0xe0, 0xab,
0xc4, 0xc7, 0xe0, 0xb0, 0x82, 0xd6, 0x93, 0xa5, 0xe7, 0xfc, 0xed, 0x67, 0x5c, 0xf4, 0x66, 0x85,
0x12, 0x77, 0x2c, 0x0c, 0xbc, 0x64, 0xa7, 0x42, 0xc6, 0xc6, 0x30, 0xf5, 0x33, 0xc8, 0xcc, 0x72,
0xf6, 0x2a, 0xe8, 0x33, 0xc4, 0x0b, 0xf2, 0x58, 0x42, 0xe9, 0x84, 0xbb, 0x78, 0xbd, 0xbf, 0x97,
0xc0, 0x10, 0x7d, 0x55, 0xbd, 0xb6, 0x62, 0xf5, 0xc4, 0xe0, 0xfa, 0xb9, 0x84, 0x5c, 0xb5, 0x14,
0x8e, 0xf7, 0x39, 0x2d, 0xd3, 0xaa, 0xff, 0x93, 0xae, 0x1e, 0x6b, 0x66, 0x7b, 0xb3, 0xd4, 0x24,
0x76, 0x16, 0xd4, 0xf5, 0xba, 0x10, 0xd4, 0xcf, 0xd2, 0x26, 0xde, 0x88, 0xd3, 0x9f, 0x16, 0xfb
};

/* Public exponent: */
const uint8_t pub_exponent[] PROGMEM = { 0x01, 0x00, 0x01 };

/* Exponent (PRIVATE): */
const uint8_t priv_exponent[] PROGMEM = {
0x53, 0x33, 0x9c, 0xfd, 0xb7, 0x9f, 0xc8, 0x46, 0x6a, 0x65, 0x5c, 0x73, 0x16, 0xac, 0xa8, 0x5c,
0x55, 0xfd, 0x8f, 0x6d, 0xd8, 0x98, 0xfd, 0xaf, 0x11, 0x95, 0x17, 0xef, 0x4f, 0x52, 0xe8, 0xfd,
0x8e, 0x25, 0x8d, 0xf9, 0x3f, 0xee, 0x18, 0x0f, 0xa0, 0xe4, 0xab, 0x29, 0x69, 0x3c, 0xd8, 0x3b,
0x15, 0x2a, 0x55, 0x3d, 0x4a, 0xc4, 0xd1, 0x81, 0x2b, 0x8b, 0x9f, 0xa5, 0xaf, 0x0e, 0x7f, 0x55,
0xfe, 0x73, 0x04, 0xdf, 0x41, 0x57, 0x09, 0x26, 0xf3, 0x31, 0x1f, 0x15, 0xc4, 0xd6, 0x5a, 0x73,
0x2c, 0x48, 0x31, 0x16, 0xee, 0x3d, 0x3d, 0x2d, 0x0a, 0xf3, 0x54, 0x9a, 0xd9, 0xbf, 0x7c, 0xbf,
0xb7, 0x8a, 0xd8, 0x84, 0xf8, 0x4d, 0x5b, 0xeb, 0x04, 0x72, 0x4d, 0xc7, 0x36, 0x9b, 0x31, 0xde,
0xf3, 0x7d, 0x0c, 0xf5, 0x39, 0xe9, 0xcf, 0xcd, 0xd3, 0xde, 0x65, 0x37, 0x29, 0xea, 0xd5, 0xd1
};

/* Prime 1: */
const uint8_t p[] PROGMEM = {
0xd3, 0x27, 0x37, 0xe7, 0x26, 0x7f, 0xfe, 0x13, 0x41, 0xb2, 0xd5, 0xc0, 0xd1, 0x50, 0xa8, 0x1b,
0x58, 0x6f, 0xb3, 0x13, 0x2b, 0xed, 0x2f, 0x8d, 0x52, 0x62, 0x86, 0x4a, 0x9c, 0xb9, 0xf3, 0x0a,
0xf3, 0x8b, 0xe4, 0x48, 0x59, 0x8d, 0x41, 0x3a, 0x17, 0x2e, 0xfb, 0x80, 0x2c, 0x21, 0xac, 0xf1,
0xc1, 0x1c, 0x52, 0x0c, 0x2f, 0x26, 0xa4, 0x71, 0xdc, 0xad, 0x21, 0x2e, 0xac, 0x7c, 0xa3, 0x9d
};


/* Prime 2: */
const uint8_t q[] PROGMEM = {
0xcc, 0x88, 0x53, 0xd1, 0xd5, 0x4d, 0xa6, 0x30, 0xfa, 0xc0, 0x04, 0xf4, 0x71, 0xf2, 0x81, 0xc7,
0xb8, 0x98, 0x2d, 0x82, 0x24, 0xa4, 0x90, 0xed, 0xbe, 0xb3, 0x3d, 0x3e, 0x3d, 0x5c, 0xc9, 0x3c,
0x47, 0x65, 0x70, 0x3d, 0x1d, 0xd7, 0x91, 0x64, 0x2f, 0x1f, 0x11, 0x6a, 0x0d, 0xd8, 0x52, 0xbe,
0x24, 0x19, 0xb2, 0xaf, 0x72, 0xbf, 0xe9, 0xa0, 0x30, 0xe8, 0x60, 0xb0, 0x28, 0x8b, 0x5d, 0x77
};


/* Prime exponent 1: */
const uint8_t dp[] PROGMEM = {
0x0e, 0x12, 0xbf, 0x17, 0x18, 0xe9, 0xce, 0xf5, 0x59, 0x9b, 0xa1, 0xc3, 0x88, 0x2f, 0xe8, 0x04,
0x6a, 0x90, 0x87, 0x4e, 0xef, 0xce, 0x8f, 0x2c, 0xcc, 0x20, 0xe4, 0xf2, 0x74, 0x1f, 0xb0, 0xa3,
0x3a, 0x38, 0x48, 0xae, 0xc9, 0xc9, 0x30, 0x5f, 0xbe, 0xcb, 0xd2, 0xd7, 0x68, 0x19, 0x96, 0x7d,
0x46, 0x71, 0xac, 0xc6, 0x43, 0x1e, 0x40, 0x37, 0x96, 0x8d, 0xb3, 0x78, 0x78, 0xe6, 0x95, 0xc1
};

/* Prime exponent 2: */
const uint8_t dq[] PROGMEM = {

0x95, 0x29, 0x7b, 0x0f, 0x95, 0xa2, 0xfa, 0x67, 0xd0, 0x07, 0x07, 0xd6, 0x09, 0xdf, 0xd4, 0xfc,
0x05, 0xc8, 0x9d, 0xaf, 0xc2, 0xef, 0x6d, 0x6e, 0xa5, 0x5b, 0xec, 0x77, 0x1e, 0xa3, 0x33, 0x73,
0x4d, 0x92, 0x51, 0xe7, 0x90, 0x82, 0xec, 0xda, 0x86, 0x6e, 0xfe, 0xf1, 0x3c, 0x45, 0x9e, 0x1a,
0x63, 0x13, 0x86, 0xb7, 0xe3, 0x54, 0xc8, 0x99, 0xf5, 0xf1, 0x12, 0xca, 0x85, 0xd7, 0x15, 0x83
};

/* Coefficient: */
const uint8_t qinv[] PROGMEM = {
0x4f, 0x45, 0x6c, 0x50, 0x24, 0x93, 0xbd, 0xc0, 0xed, 0x2a, 0xb7, 0x56, 0xa3, 0xa6, 0xed, 0x4d,
0x67, 0x35, 0x2a, 0x69, 0x7d, 0x42, 0x16, 0xe9, 0x32, 0x12, 0xb1, 0x27, 0xa6, 0x3d, 0x54, 0x11,
0xce, 0x6f, 0xa9, 0x8d, 0x5d, 0xbe, 0xfd, 0x73, 0x26, 0x3e, 0x37, 0x28, 0x14, 0x27, 0x43, 0x81,
0x81, 0x66, 0xed, 0x7d, 0xd6, 0x36, 0x87, 0xdd, 0x2a, 0x8c, 0xa1, 0xd2, 0xf4, 0xfb, 0xd8, 0xe1
};

/**********************************************************************************************
   RSA KEY #1
**********************************************************************************************/

/* Modulus: */
const uint8_t modulus_1[] PROGMEM = {
0x98, 0xb7, 0x05, 0x82, 0xca, 0x80, 0x8f, 0xd1, 0xd3, 0x50, 0x95, 0x62, 0xa0, 0xef, 0x30, 0x5a,
0xf6, 0xd9, 0x87, 0x54, 0x43, 0xb3, 0x5b, 0xdf, 0x24, 0xd5, 0x36, 0x35, 0x3e, 0x3f, 0x12, 0x28,
0xdc, 0xd1, 0x2a, 0x78, 0x56, 0x83, 0x56, 0xc6, 0xff, 0x32, 0x3a, 0xbf, 0x72, 0xac, 0x1c, 0xdb,
0xfe, 0x71, 0x2f, 0xb4, 0x9f, 0xe5, 0x94, 0xa5, 0xa2, 0x17, 0x5d, 0x48, 0xb6, 0x73, 0x25, 0x38,
0xd8, 0xdf, 0x37, 0xcb, 0x97, 0x0b, 0xe4, 0xa5, 0xb5, 0x62, 0xc3, 0xf2, 0x98, 0xdb, 0x9d, 0xdf,
0x75, 0x60, 0x78, 0x77, 0x91, 0x8c, 0xce, 0xd1, 0xd0, 0xd1, 0xf3, 0x77, 0x33, 0x8c, 0x0d, 0x3d,
0x32, 0x07, 0x79, 0x7e, 0x86, 0x2c, 0x65, 0xd1, 0x14, 0x39, 0xe5, 0x88, 0x17, 0x75, 0x27, 0xa7,
0xde, 0xd9, 0x19, 0x71, 0xad, 0xcf, 0x91, 0xe2, 0xe8, 0x34, 0xe3, 0x7f, 0x05, 0xa7, 0x36, 0x55
};

/* Public exponent: */
const uint8_t pub_exponent_1[] PROGMEM = { 0x01, 0x00, 0x01 };

/* Exponent (PRIVATE): */
const uint8_t priv_exponent_1[] PROGMEM = {
0x06, 0x14, 0xa7, 0x86, 0x05, 0x2d, 0x28, 0x4c, 0xd9, 0x06, 0xa8, 0xe4, 0x13, 0xf7, 0x62, 0x2c,
0x05, 0x0f, 0x35, 0x49, 0xc0, 0x26, 0x58, 0x9e, 0xa2, 0x77, 0x50, 0xe0, 0xbe, 0xd9, 0x41, 0x0e,
0x5a, 0x78, 0x83, 0xa1, 0xe6, 0x03, 0xf5, 0xc5, 0x17, 0xad, 0x36, 0xd4, 0x9f, 0xaa, 0xc5, 0xbd,
0x66, 0xbc, 0xb8, 0x03, 0x0f, 0xa8, 0xd3, 0x09, 0xe3, 0x51, 0xdd, 0xd7, 0x82, 0xd8, 0x43, 0xdf,
0x97, 0x56, 0x80, 0xae, 0x73, 0xee, 0xa9, 0xaa, 0xb2, 0x89, 0xb7, 0x57, 0x20, 0x5d, 0xad, 0xb8,
0xfd, 0xfb, 0x98, 0x9e, 0xc8, 0xdb, 0x8e, 0x70, 0x95, 0xf5, 0x1f, 0x24, 0x52, 0x9f, 0x56, 0x37,
0xaa, 0x66, 0x93, 0x31, 0xe2, 0x56, 0x9f, 0x8b, 0x85, 0x4a, 0xbe, 0xce, 0xc9, 0x9a, 0xa2, 0x64,
0xc3, 0xda, 0x7c, 0xc6, 0x86, 0x6f, 0x0c, 0x0e, 0x1f, 0xb8, 0x46, 0x98, 0x48, 0x58, 0x1c, 0x73
};

/* Prime 1: */
const uint8_t p_1[] PROGMEM = {
0xcb, 0x61, 0xa8, 0x8c, 0x8c, 0x30, 0x5a, 0xd9, 0xa8, 0xfb, 0xec, 0x2b, 0xa4, 0xc8, 0x6c, 0xcc,
0xc2, 0x02, 0x80, 0x24, 0xaa, 0x16, 0x90, 0xc2, 0x9b, 0xc8, 0x26, 0x4d, 0x2f, 0xeb, 0xe8, 0x7e,
0x4f, 0x86, 0xe9, 0x12, 0xef, 0x0f, 0x5c, 0x18, 0x53, 0xd7, 0x1c, 0xbc, 0x9b, 0x14, 0xba, 0xed,
0x3c, 0x37, 0xce, 0xf6, 0xc7, 0xa3, 0x59, 0x8b, 0x6f, 0xbe, 0x06, 0x48, 0x10, 0x90, 0x5b, 0x57
};


/* Prime 2: */
const uint8_t q_1[] PROGMEM = {
0xc0, 0x39, 0x9f, 0x0b, 0x93, 0x80, 0xfa, 0xba, 0x38, 0xff, 0x80, 0xd2, 0xff, 0xf6, 0xed, 0xe7,
0x9c, 0xfd, 0xab, 0xf6, 0x58, 0x97, 0x20, 0x77, 0xa5, 0xe2, 0xb2, 0x95, 0x69, 0x3e, 0xa5, 0x10,
0x72, 0x26, 0x8b, 0x91, 0x74, 0x6e, 0xea, 0x9b, 0xe0, 0x4a, 0xd6, 0x61, 0x00, 0xeb, 0xed, 0x73,
0x3d, 0xb4, 0xcd, 0x01, 0x47, 0xa1, 0x8d, 0x6d, 0xe8, 0xc0, 0xcd, 0x8f, 0xbf, 0x24, 0x9c, 0x33
};


/* Prime exponent 1: */
const uint8_t dp_1[] PROGMEM = {
0x94, 0x4c, 0x3a, 0x65, 0x79, 0x57, 0x4c, 0xf7, 0x87, 0x33, 0x62, 0xab, 0x14, 0x35, 0x9c, 0xb7,
0xd5, 0x03, 0x93, 0xc2, 0xa8, 0x4f, 0x59, 0xf0, 0xbd, 0x3c, 0xbd, 0x48, 0xed, 0x17, 0x7c, 0x68,
0x95, 0xbe, 0x8e, 0xb6, 0xe2, 0x9f, 0xf5, 0x8c, 0x3b, 0x9e, 0x0f, 0xf3, 0x2a, 0xb5, 0x7b, 0xf3,
0xbe, 0x44, 0x07, 0x62, 0x84, 0x81, 0x84, 0xaa, 0x9a, 0xa9, 0x19, 0xd5, 0x74, 0x56, 0x7e, 0x73
};

/* Prime exponent 2: */
const uint8_t dq_1[] PROGMEM = {

0x45, 0xeb, 0xef, 0xd5, 0x87, 0x27, 0x30, 0x8c, 0xd2, 0xb4, 0xe6, 0x08, 0x5a, 0x81, 0x58, 0xd2,
0x9a, 0x41, 0x8f, 0xee, 0xc1, 0x14, 0xe0, 0x03, 0x85, 0xbc, 0xeb, 0x96, 0xfb, 0xbc, 0x84, 0xd0,
0x71, 0xa5, 0x61, 0xb9, 0x5c, 0x30, 0x08, 0x79, 0x00, 0xe2, 0x58, 0x0e, 0xdb, 0x05, 0xf6, 0xce,
0xa7, 0x90, 0x7f, 0xcd, 0xca, 0x5f, 0x92, 0x91, 0x7b, 0x4b, 0xbe, 0xba, 0x5e, 0x1e, 0x14, 0x0f
};

/* Coefficient: */
const uint8_t qinv_1[] PROGMEM = {
0xc5, 0x24, 0x68, 0xc8, 0xfd, 0x15, 0xe5, 0xda, 0x2f, 0x6c, 0x8e, 0xba, 0x4e, 0x97, 0xba, 0xeb,
0xe9, 0x95, 0xb6, 0x7a, 0x1a, 0x7a, 0xd7, 0x19, 0xdd, 0x9f, 0xff, 0x36, 0x6b, 0x18, 0x4d, 0x5a,
0xb4, 0x55, 0x07, 0x59, 0x09, 0x29, 0x20, 0x44, 0xec, 0xb3, 0x45, 0xcf, 0x2c, 0xdd, 0x26, 0x22,
0x8e, 0x21, 0xf8, 0x51, 0x83, 0x25, 0x5f, 0x4a, 0x9e, 0x69, 0xf4, 0xc7, 0x15, 0x2e, 0xbb, 0x0f
};

/* Message: */
const uint8_t message_x[] PROGMEM = {
0x66, 0x28, 0x19, 0x4e, 0x12, 0x07, 0x3d, 0xb0, 0x3b, 0xa9, 0x4c, 0xda, 0x9e, 0xf9, 0x53, 0x23,
0x97, 0xd5, 0x0d, 0xba, 0x79, 0xb9, 0x87, 0x00, 0x4a, 0xfe, 0xfe, 0x34
};

/* Seed: */
const uint8_t seed_x[] PROGMEM = {
0x01, 0x73, 0x41, 0xae, 0x38, 0x75, 0xd5, 0xf8, 0x71, 0x01, 0xf8, 0xcc, 0x4f, 0xa9, 0xb9, 0xbc,
0x15, 0x6b, 0xb0, 0x46, 0x28, 0xfc, 0xcd, 0xb2, 0xf4, 0xf1, 0x1e, 0x90, 0x5b, 0xd3, 0xa1, 0x55,
0xd3, 0x76, 0xf5, 0x93, 0xbd, 0x73, 0x04, 0x21, 0x08, 0x74, 0xeb, 0xa0, 0x8a, 0x5e, 0x22, 0xbc,
0xcc, 0xb4, 0xc9, 0xd3, 0x88, 0x2a, 0x93, 0xa5, 0x4d, 0xb0, 0x22, 0xf5, 0x03, 0xd1, 0x63, 0x38,
0xb6, 0xb7, 0xce, 0x16, 0xdc, 0x7f, 0x4b, 0xbf, 0x9a, 0x96, 0xb5, 0x97, 0x72, 0xd6, 0x60, 0x6e,
0x97, 0x47, 0xc7, 0x64, 0x9b, 0xf9, 0xe0, 0x83, 0xdb, 0x98, 0x18, 0x84, 0xa9, 0x54, 0xab, 0x3c,
0x6f };

/* Encryption: */
const uint8_t encrypted_x[] PROGMEM = {

0x50, 0xb4, 0xc1, 0x41, 0x36, 0xbd, 0x19, 0x8c, 0x2f, 0x3c, 0x3e, 0xd2, 0x43, 0xfc, 0xe0, 0x36,
0xe1, 0x68, 0xd5, 0x65, 0x17, 0x98, 0x4a, 0x26, 0x3c, 0xd6, 0x64, 0x92, 0xb8, 0x08, 0x04, 0xf1,
0x69, 0xd2, 0x10, 0xf2, 0xb9, 0xbd, 0xfb, 0x48, 0xb1, 0x2f, 0x9e, 0xa0, 0x50, 0x09, 0xc7, 0x7d,
0xa2, 0x57, 0xcc, 0x60, 0x0c, 0xce, 0xfe, 0x3a, 0x62, 0x83, 0x78, 0x9d, 0x8e, 0xa0, 0xe6, 0x07,
0xac, 0x58, 0xe2, 0x69, 0x0e, 0xc4, 0xeb, 0xc1, 0x01, 0x46, 0xe8, 0xcb, 0xaa, 0x5e, 0xd4, 0xd5,
0xcc, 0xe6, 0xfe, 0x7b, 0x0f, 0xf9, 0xef, 0xc1, 0xea, 0xbb, 0x56, 0x4d, 0xbf, 0x49, 0x82, 0x85,
0xf4, 0x49, 0xee, 0x61, 0xdd, 0x7b, 0x42, 0xee, 0x5b, 0x58, 0x92, 0xcb, 0x90, 0x60, 0x1f, 0x30,
0xcd, 0xa0, 0x7b, 0xf2, 0x64, 0x89, 0x31, 0x0b, 0xcd, 0x23, 0xb5, 0x28, 0xce, 0xab, 0x3c, 0x31
};


uint8_t keys_allocated = 0;
rsa_publickey_t pub_key;
rsa_privatekey_t priv_key;

#define MSG       message_x
#define SEED      seed_x
#define ENCRYPTED encrypted_x
#define MODULUS modulus
#define PUB_EXPONENT pub_exponent
#define PRIV_EXPONENT priv_exponent
#define P p
#define Q q
#define DP dp
#define DQ dq
#define QINV qinv

#ifndef MAX
 #define MAX(a,b) (((a)>(b))?(a):(b))
#endif

/* The following helper functions copied from the RSA tests in avr-crypto-lib */
uint8_t load_bigint_from_os(bigint_t* a, PGM_VOID_P os, uint16_t length_B){
	a->length_B = BIGINT_CEIL(length_B) / sizeof(bigint_word_t);
	a->wordv = malloc(BIGINT_CEIL(length_B));
	if(!a->wordv){
        putch('F');
        while(1);
		return 1;
	}
	memset(a->wordv, 0, sizeof(bigint_word_t));
	memcpy_P((uint8_t*)a->wordv + BIGINT_OFF(length_B), os, length_B);
	a->info = 0;
	bigint_changeendianess(a);
	bigint_adjust(a);
	return 0;
}

uint8_t pre_alloc_key_crt(void){
	priv_key.n = 5;
	priv_key.components = malloc(5 * sizeof(bigint_t));
	if(!priv_key.components){
		//cli_putstr_P(PSTR("\r\nERROR: OOM!"));
		return 2;
	}
	return 0;
}

void load_key(uint8_t use_fake)
{
    if (use_fake){
        /* This "Fake" data loads part of a different private key. You could also set a few bytes
           of the private key to 0 for example, although you need to ensure you don't put invalid
           data. Play around with the real_dec() version first. */
         load_bigint_from_os(&pub_key.modulus, MODULUS, sizeof(MODULUS));
        memcpy(&priv_key.modulus, &pub_key.modulus, sizeof(bigint_t));
        load_bigint_from_os(&pub_key.exponent, PUB_EXPONENT, sizeof(PUB_EXPONENT));
        priv_key.n = 5;
        load_bigint_from_os(&(priv_key.components[0]), P, sizeof(P));
        load_bigint_from_os(&(priv_key.components[1]), Q, sizeof(Q));
        load_bigint_from_os(&(priv_key.components[2]), dp_1, sizeof(DP));
        load_bigint_from_os(&(priv_key.components[3]), DQ, sizeof(DQ));
        load_bigint_from_os(&(priv_key.components[4]), QINV, sizeof(QINV));
    } else {
        /* This is the "real" pub/priv data */
        load_bigint_from_os(&pub_key.modulus, MODULUS, sizeof(MODULUS));
        memcpy(&priv_key.modulus, &pub_key.modulus, sizeof(bigint_t));
        load_bigint_from_os(&pub_key.exponent, PUB_EXPONENT, sizeof(PUB_EXPONENT));
        priv_key.n = 5;
        load_bigint_from_os(&(priv_key.components[0]), P, sizeof(P));
        load_bigint_from_os(&(priv_key.components[1]), Q, sizeof(Q));
        load_bigint_from_os(&(priv_key.components[2]), DP, sizeof(DP));
        load_bigint_from_os(&(priv_key.components[3]), DQ, sizeof(DQ));
        load_bigint_from_os(&(priv_key.components[4]), QINV, sizeof(QINV));
    }
}


static bigint_t cp;

/* Perform a real RSA decryption, be aware this is VERY SLOW on AVR/XMEGA. At 7.37MHz using the default
   1024 byte key it takes about 687 seconds (over 10 mins). */
uint8_t real_dec(uint8_t * pt, uint8_t len)
{
    /* Load encrypted message */
    load_bigint_from_os(&cp, ENCRYPTED, sizeof(ENCRYPTED));

    //Do an encryption on constant data
    trigger_high();
    if (rsa_dec(&cp, &priv_key)){
        putch('F');
    }
    trigger_low();
    return 0;
}

/* Performs PART of a RSA decryption using only 16 bytes of keying material, where the "key" is
   actually the 16-byte input plaintext (sent with 'p' command). This is used to give you an easier
   target to perform SPA on rather than the full (very slow) RSA algorithm. */
uint8_t get_pt(uint8_t * pt, uint8_t len)
{
	uint8_t flag = 0;

    const bigint_t* r = &(priv_key.components[0]);
    const bigint_t* a = ENCRYPTED;


    bigint_t res, base;
	bigint_word_t t, base_b[MAX(a->length_B,r->length_B)], res_b[r->length_B*2];
	uint16_t i;
	uint8_t j;
	res.wordv = res_b;
	base.wordv = base_b;
	bigint_copy(&base, a);
	bigint_reduce(&base, r);
	res.wordv[0]=1;
	res.length_B=1;
	res.info = 0;
	bigint_adjust(&res);

    trigger_high();


	for(i = 0; i < 16; i++) {

		//t = exp->wordv[i - 1];
        t = pt[i];

		for(j=8; j > 0; --j){
			if(!flag){
				if(t & (1<<(8-1))){
					flag = 1;
				}
			}
			if(flag){
				bigint_square(&res, &res);
				bigint_reduce(&res, r);
				if(t & (1<<(8-1))){
					bigint_mul_u(&res, &res, &base);
					bigint_reduce(&res, r);
				}
			}
			t<<=1;
		}
	}

    trigger_low();

    return 0;
}

void rsa_init(void)
{
    pre_alloc_key_crt();
    load_key(0);
}

#endif
